Disable waiting in the libcheck_pending() checker class functions. Instead, they now just check if the checker has already completed. A future patch will re-add waiting outside of libcheck_pending(). Reviewed-by: Martin Wilck <mwilck@xxxxxxxx> Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx> --- libmultipath/checkers/directio.c | 41 ++++++++++++++++---------------- libmultipath/checkers/tur.c | 20 +++------------- 2 files changed, 23 insertions(+), 38 deletions(-) diff --git a/libmultipath/checkers/directio.c b/libmultipath/checkers/directio.c index 54c12f7b..27227894 100644 --- a/libmultipath/checkers/directio.c +++ b/libmultipath/checkers/directio.c @@ -64,7 +64,6 @@ struct directio_context { int reset_flags; struct aio_group *aio_grp; struct async_req *req; - struct timespec endtime; bool checked_state; }; @@ -291,18 +290,17 @@ get_events(struct aio_group *aio_grp, struct timespec *timeout) } static void -check_pending(struct directio_context *ct, struct timespec endtime) +check_pending(struct directio_context *ct, struct timespec timeout) { int r; - struct timespec currtime, timeout; + struct timespec endtime, currtime; ct->checked_state = true; + get_monotonic_time(&endtime); + endtime.tv_sec += timeout.tv_sec; + endtime.tv_nsec += timeout.tv_nsec; + normalize_timespec(&endtime); while(1) { - get_monotonic_time(&currtime); - timespecsub(&endtime, &currtime, &timeout); - if (timeout.tv_sec < 0) - timeout.tv_sec = timeout.tv_nsec = 0; - r = get_events(ct->aio_grp, &timeout); if (ct->req->state != PATH_PENDING) { @@ -311,6 +309,10 @@ check_pending(struct directio_context *ct, struct timespec endtime) } else if (r == 0 || (timeout.tv_sec == 0 && timeout.tv_nsec == 0)) return; + get_monotonic_time(&currtime); + timespecsub(&endtime, &currtime, &timeout); + if (timeout.tv_sec < 0) + timeout.tv_sec = timeout.tv_nsec = 0; } } @@ -320,7 +322,7 @@ check_state(int fd, struct directio_context *ct, int sync, int timeout_secs) struct stat sb; int rc; struct io_event event; - struct timespec endtime; + struct timespec timeout = { .tv_sec = timeout_secs }; if (fstat(fd, &sb) == 0) { LOG(4, "called for %x", (unsigned) sb.st_rdev); @@ -346,20 +348,13 @@ check_state(int fd, struct directio_context *ct, int sync, int timeout_secs) LOG(3, "io_submit error %i", -rc); return PATH_UNCHECKED; } - get_monotonic_time(&ct->endtime); - ct->endtime.tv_nsec += 1000 * 1000; - normalize_timespec(&ct->endtime); ct->checked_state = false; } ct->running++; if (!sync) return PATH_PENDING; - get_monotonic_time(&endtime); - endtime.tv_sec += timeout_secs; - normalize_timespec(&endtime); - - check_pending(ct, endtime); + check_pending(ct, timeout); if (ct->req->state != PATH_PENDING) return ct->req->state; @@ -402,13 +397,16 @@ int libcheck_pending(struct checker *c) int rc; struct io_event event; struct directio_context *ct = (struct directio_context *)c->context; + struct timespec no_wait = { .tv_sec = 0 }; /* The if path checker isn't running, just return the exiting value. */ - if (!ct || !ct->running) - return c->path_state; + if (!ct || !ct->running) { + rc = c->path_state; + goto out; + } if (ct->req->state == PATH_PENDING) - check_pending(ct, ct->endtime); + check_pending(ct, no_wait); else ct->running = 0; rc = ct->req->state; @@ -421,8 +419,9 @@ int libcheck_pending(struct checker *c) else LOG(4, "async io pending"); } - set_msgid(c, rc); +out: + set_msgid(c, rc); return rc; } diff --git a/libmultipath/checkers/tur.c b/libmultipath/checkers/tur.c index f7e6a483..e70a2e11 100644 --- a/libmultipath/checkers/tur.c +++ b/libmultipath/checkers/tur.c @@ -58,7 +58,6 @@ struct tur_checker_context { int msgid; struct checker_context ctx; unsigned int nr_timeouts; - struct timespec endtime; bool checked_state; }; @@ -299,14 +298,6 @@ void *libcheck_thread(struct checker_context *ctx) return ((void *)0); } - -static void tur_timeout(struct timespec *tsp) -{ - get_monotonic_time(tsp); - tsp->tv_nsec += 1000 * 1000; /* 1 millisecond */ - normalize_timespec(tsp); -} - static void tur_set_async_timeout(struct checker *c) { struct tur_checker_context *ct = c->context; @@ -328,16 +319,12 @@ static int tur_check_async_timeout(struct checker *c) int check_pending(struct checker *c) { struct tur_checker_context *ct = c->context; - int r, tur_status = PATH_PENDING; + int tur_status = PATH_PENDING; pthread_mutex_lock(&ct->lock); - for (r = 0; - r == 0 && ct->state == PATH_PENDING && - ct->msgid == MSG_TUR_RUNNING; - r = pthread_cond_timedwait(&ct->active, &ct->lock, &ct->endtime)); - - if (!r) { + if (ct->state != PATH_PENDING || ct->msgid != MSG_TUR_RUNNING) + { tur_status = ct->state; c->msgid = ct->msgid; } @@ -488,7 +475,6 @@ int libcheck_check(struct checker * c) " sync mode", major(ct->devt), minor(ct->devt)); return tur_check(c->fd, c->timeout, &c->msgid); } - tur_timeout(&ct->endtime); } return tur_status; -- 2.45.0